Belphegor is an optional boss encountered as a Nemesis in Norende. Belphegor is a very special case in terms of how he is fought: he absorbs all damage done to him, except for his weakness. On top of that, his weakness will change whenever he is successfully damaged.

Belphegor is an optional boss that can be fought as part of the seven sins sidequest in order to fully use the Diabolism skillset of the Yōkaiasterisk. It represents the sin of Sloth. When defeated, he allows the Yōkai to use the abilities Sloth and Firaga.

[view·edit·purge]In demonology, Belphegor is a demon and one of the seven princes of Hell who suggests ingenious inventions that will make people rich, although Bishop and witch-hunter Peter Binsfeld believed Belphegor to tempt by means of laziness. According to Peter Binsfeld's Binsfeld's Classification of Demons, Belphegor is the chief demon of the deadly sin Sloth.

Belphegor originated as the Assyrian Baal-Peor, the Moabitish god to whom the Israelites became attached in Shittim (Numbers 25:3), which was associated with licentiousness and orgies. As a demon, he is described in Kabbalistic writings as the "disputer," an enemy of the sixth Sephiroth "beauty." When summoned, he can grant riches, the power of discovery and ingenious invention. His role as a demon was to sow discord among men and seduce them to evil through the apportionment of wealth.